Spring-tooth harrow



I (No Model.) P. A. SPIGER. SPRING TOOTH HARROW.

No. 898,858. Patented Mar. 5, 1889.

witnesses,

UNiTn STATES ATnNT FFICE.

PRATT A. SPICER, OF MARSHALL, MICHIGAN.

SPRING-TOOTH HARROW.

SPECIFZCATION forming part of Letters Patent No. 398,858, dated March 5, 1889.

Application filed September 29, 1887. Renewed July 25, 1888- Serial No. 281,035. (No model.)

struct a simple and inexpensive holder or.

shoe for the harrow-tooth, which will serve the double purpose of a holder and a stop for the tooth, preventing its becoming broken under heavy strain and protecting its front edge from wear, and as a runner for the harrow, holding it up and protecting it from wear transverse recess, F, for the reception of the and at the same time preventing it from becoming loaded by earth.

My invention further consists in certain peculiarities in the construction, arrangement, and combination of parts, substantially as will be hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings illustrating my invention, and in which similar letters of reference denote corresponding parts throughout the several views, Figure 1 is a perspective of a harrow embodying my invention. Fig. 2 is a detail representation of the springtooth holder, showing the tooth in position therein. Fig. 3 is a detail representation, in perspective, of the holder, showing its con struction more clearly. Fig. 4 is a rear end elevation of the same, showing more clearly the slot for the reception of the harrow-tooth. Fig. 5 is .a side elevation of the holder. Fig. (I; is a bottom view of the holder with a tooth secured thereto. Fig. 7 is a detail represel'itation oi. that portion of the harrowtooth formed with the series of graduated notches or marks. Fig. 8 is a modification of the holder or shoe. Fig. 0 is a detail of the bolt and plate.

A represents a harrmv-framc, which in av be of any suitable construction, and to which is attached a draw-bar, B, to which the motive power is adapted to be secured.

1 its under side by heavily dragging on the surface of the ground.

This holder or shoe is the main feature of my invention, and is prefcrably formed slightly curved, in order to conform to the curvature of the tooth, and it is constructed on its outer side with a rib, D, running longitudinally and forming the runner proper for the harrow. This holder C isformed also on its under side at one of its extremities with a downwardlycxtending lug or projection, E, having flanges e e, and formed with a longitudinal slot, F, of a suitable size for the reception of the harrow-tooth, and with a tooth-clamping device, to be hereinafter described. This holder or shoe 0 is secured to the harrow-framc, preferably by means of the bolts f f, extending down through perforations formed in each side of the said holder and at suitable distances from the ends and down through perforations formed in the harrow-frame, and are secured to the upper side of said frame by means of nuts g. The blunt end of the tooth is adapted to be inserted in the slot F, and is held securely therein from displacement by means of a set-screw, H, extending through a perforation formed in the harrow-lranie,and carrying a plate, I, having a screw-threaded perforation, 'i, for the reception of the end of the said set-screw H. This plate I is adapted to be situated on the under side of the harrowfranie, between it and the tooth, and within the recess and it is made of such size as to conveniently fit therein. Obviously, by turning this set-screw II in a certain direction its point will. project out beyond the top of the said plate and will come in contact with the tooth and bind it tightly against the shoe or holder, and by continuing to turn the said screw the plate will be crowded against the frame, and the tooth will thus be held so tightly that it cannot move or become dis placed.

The tooth, when under strain, will rest in the groove of the shoe or holder and will pry up under the lug cast on the upper side of the said shoe at its rear end, and, by reason of the fact that the said shoe or holder is bolted solidly to the frame of the harrow, the action of the tooth in labor is to cause it to lie down snugly to the bed of the tooth-holder, and this plate I and set-screw II have then no duty but to hold the tooth when released from strain and prevent it slipping back and forth.

When it is desired to change the set of any or all of the teeth, it is accomplished simply by turning the set-screw H with a wrench or other suitable device, which releases the pressure upon the tooth, permitting it to be moved forward or backward, as the case may be, to cause the tooth to run shallower or deeper.

Referring to Fig. 8, which shows a 1nodifi-- cation of the holder or shoe, it will be observed that the lug E is formed simply with the longitudinal slot- F, and the plate I, through which the screw II projects, is east solidly forward from the top of the lug which has the slot in it for the tooth, from the top part of the same, so as to have a solid flat surface where the shoe bolts up under the frame. Thus it will be obvious that this will take the place of the loose plate I, and is formed with a slotfor the set-screw, the same as the said plate I, and the tooth will be held in precisely the same manner as if the other form were employed. I have found from experience that there is less trouble in inserting the tooth with this form of shoe.

I do not wish to be understood as limiting myself to the exact construction herein shown and described, as many of the details may be Varied at will without departing from the general spirit of my invention or in any manner interfering with its usefulness.

Ila-Vin g now described the objects, uses, and advantages of my invention, and having described a preferred means of carrying the same into effect, what I believe to be new, and desire to secure by Letters Patent, and what I therefore claim, is

1. A spring-liarrow-tooth holder having on its under side a rib forming a runner, its upper side provided with a slotted bearing-lug, and the set-screw and plate, all combined and adapted for use in connection with a spring harrow-tooth and its beam, as shown and de scribed.

2. A spring-harrow-tooth holderconsisting of rib forming a runner on its under side, its upper portion provided with a slotted and recessed bearing-lug, a plate, and a set-screw, in combination with a barrow-beam and a spring-harrm -t00th, as shown and described.

In a spring-harrow-tooth holder, the combination, with the harrow-beam, of a holder provided on its under surface with a ribformin g a runner, the upper portion of said holder proyided with a slotted and recessed bearinglug, and the spring-tooth passing through the slotted portion of the lug and connected to the holder, and also adjustable thereon by means of a set-screw connecting the harrowbeam and holder, as shown and described.

In testimony whereof I affix my signature in the presence of two witnesses.

PRATT A. SPICER.

itnesses:

JOHN E. FOLEY, II. A. TILLOTSON. 

